.text
.global _start

_start:
    ldr     r0, =0x53000000  @加载看门狗到r0(立即数寻址方式)
    mov     r1, #0x0        @r1为0
    str     r1, [r0]        @看门狗设置为0

    ldr     sp, =4096       @设置栈为4K
    bl      main            @执行跳转并

halt_loop:
    b       halt_loop

